I have wanted to get into HPA guns and have started assembling gear slowly, getting a tank, then a regulator. Now I'm ready to get the gun. One option I've considered is converting a King Arms P90 I bought a while back. I think it's King Arms... I have two brochures, one says King Arms, the other says Cybergun. Anyway, I'm considering getting this drop-in kit from Bingo Airsoftworks: http://www.bingoairsoftworks.com/bingo-airsoftworks-wolverine-airsoft-smp-p90-drop-in-kit/ Particularly since it's drop-in easy and I'm not much of a tech. However, now I'm worried that I'm sinking good money into a cheap gun. I took it out back and tried adjusting its hop-up to see what kind of range I could get, and results were very uneven -- maybe 1 in every 5 shots seemed to actually have spin on it, most just dropped off quickly as if no hop-up was being applied, regardless of where I had the dial set. So, is this too cheap a gun to warrant dropping a HPA engine in there? Is there something I should do first to get the gun firing better before going HPA? Should I just look for a used gun here or elsewhere and do that instead? Thanks in advance.